3 methods of control valve cavitation damage how to distinguish? Diagnosis method to analyze three kinds of control valve cavitation damage, proposed in valve selection, make full use of rules to control the export flow, avoid or reduce the damage of the valve.
Control valve in fluid play an important role in industry. Now, with the device of energy-saving emission reduction, improve efficiency, continuous and stable operation, reduce the control valve parts, after sale service and rapid response to such requirements gradually increase, leading to more and more attention to how to optimize, the selection and use of valve control on this issue, this is because the control valve in the device plays the role of the actuator, directly determines the the operation state of the device, according to statistics due to failure of a control valve caused device parking ratio as high as 65%, control valve selection is also decided to production quality and yield. Recalling the past 5 years, the rapid development of control valve technology, some of the world's leading level control valve manufacturers have introduced the application in the special case of the valve, such as temperature, pressure differential, cavitation, flashing, part of the abrasive particles medium, high noise and other conditions; at the same time, intelligent diagnostic locator appearance, the positioner can be on the the valve is a good real-time detection, alarm information to provide maintenance, optimization of valve to use. Be above suspicion doubt, these techniques improve, greatly to ensure the stable operation of the unit, reducing the number of weak links. But how can we calculate the correct choice and use of the valve? By using the experience that, in the harsh conditions, often resulting in cavitation valve parts, with high noise, vibration, blocking flow conditions, in the calculation of valve selection, how to reduce, avoid the occurrence of cavitation, the proper use of essential for valve. At present, evaluation method of cavitation valve manufacturers are not the same, based on the KE method, method and XFz method, mainly on how to reduce, avoid cavitation and valve selection analysis application.
Control valve cavitation ( cavitation )
Control valve cavitation phenomenon refers to the maximum velocity of medium flows through the valve cavity shrinkage, flow, pressure to a minimum, if the pressure is lower than saturation steam medium pressure, liquid gasification, transformed into the bubble of water vapor or gas. When the medium flows through the reduced flow, pressure rise, if more than the value of saturated vapor pressure, the bubble burst, to the gas (vapor) phase to the liquid phase, this process is called cavitation and cavitation ( Cavitation ). When the bubble burst, spraying release enormous energy, and produce vibration wave, lab tests of 150 μ m diameter bubble rupture of droplet ejection speed reaches 400km/h, the thousands of kilograms of instantaneous blast pressure can reach, to trim surface caused by the severe impact, erosion wear, also can lead to severe vibration and high noise, occlusion flow occurs. For the serious cavitation, in a very short period of time, the work characteristics of valve parts will be damaged or the valve change.
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